[Tutor] 'source' in python or preloading variables

[John]

Does anyone know why the script below works fine (in regards to the 'source
function') but when I try to uncomment the line from mymod import source and
use it that way without defining the function in the script, I get an error
that N_id does not exist. It must have something to do with namespace and
global variables I don't understand...


#!/usr/bin/env python

from PyF import *
#from mymod import source
vList=['N_id','Nlat','Nlon','Nelv']
###### FUNCTION #########
def source(filename, vList):
        """ Reads a filename, collects variabls in file, and returns
variables.
        Usage: source(filename, vList) where vList is a list of variables.

        """
        import re
        # Read the file
        fid=open(filename,'r')
        lines = fid.readlines()
        fid.close()
        #how many variables
        ns=len(lines)/len(vList)
        #predefine the varibles
        for v in vList:
                exec( 'global %s ; %s = [0]*(ns+1)' % (v, v))

        # Make it python friendly: put all values in 'single quotes'
        cmd = '\n'.join([re.sub( r'^([^=]+)=(.*)$', r"\1='\2'", v) for v in
lines])
        exec(cmd)
        for v in vList:
                exec( "global %s ; %s = %s[1:]" % (v,v,v) )


source('sites_ALL',vList)

for s in N_id:
        fw=stnWeb(s)
        fw.mkStnBase()
fw.mkWebBase()
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